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Page: 1
Service Manual - OKIJET 2500
Chapter 0 Introduction

Front Cover

OKIJET 2500 Service Manual

P/ N 59228801

Adobe Acrobat printable reference copy
of the OKIDATA Service Training Manual.
03/20/98

Note: This Adobe Acrobat version of the Okidata Service Training Manual was built with
the pictures rendered at 300 dpi, which is ideal for printing, but does not display well
on most displays.

Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Table of Contents Page

Service Manual - OKIJET 2500
0 Introduction
Front Cover 1
Disclaimer/Copyright 2
About This Manual 3
Organization 4
....Section 1 - SERVICE CALL PROCEDURES 5
....Section 2 - REPAIR ANALYSIS PROCEDURES (RAPs) 6
....Section 3 - IMAGE QUALITY REPAIR ANALYSIS 7
PROCEDURES (RAPs)
....Section 4 - REPAIR / ADJUSTMENT PROCEDURES 8
....Section 5 - PARTS LIST 9
....Section 6 - GENERAL PROCEDURES 10
....Section 7 - WIRING DATA 11
How To Use This Manual 12
Reference Symbology 13
Special Symbols 14
Signal Nomenclature 15
DC Voltage Levels 16
Switches and Relay Contacts 17
Back Cover 18
1 Service Call Procedures
Introduction 19
....Printer Maintenance 20
....Initial Actions 21
....System Checkout / Final Action 22
2 Repair Analysis Procedures (RAPs)
Error LED On RAP 23
Power LED Blinking RAP 24
Low Ink LED(s) On RAP 25
Error LED Flashing RAP 26
1.1 Power on RAP 27
2.1 Selection/Indication RAP 28
6.1 Carriage TAP 29
6.2 Encoder RAP 30
8.1 Paper Feed RAP 31
9.1 Blank Print RAP 32
3 Image Quality RAPs
IQ 1 Image Defect Entry RAP 33
IQ 1 Image Defect Entry RAP Table 34
4 Repair / Adjustment Procedures
REP 1.0 Printhead 35
REP 1.1 Paper Tray Assembly 36
Table of Contents Page
REP 1.2 Cartridge Cover 37
REP 1.3 Top Cover 38
REP 1.4 Exit Guide 39
REP 1.5 Paper Feed / Carriage Assy. 40
REP 1.6 Power Supply 41
REP 1.7 Main Control Board 42
REP 1.8 Waste Ink Pad 43
REP 1.9 Pump 44
REP 1.10 Maintenance Station 45
REP 1.11 Encoder 46
REP 1.12 Control Panel Assembly 47
REP 1.13 Paper Path Sensor (SW 1) 48
REP 1.14 Back Pad 49
REP 1.15 Printhead Ribbon Cable 50
REP 1.16 Ink Level Sensor 51
ADJ 2.0 Printhead Alignment 52
5 Parts List
PL 1.1 Printer Components 53
PL 2.1 Paper Feed / Carriage Assembly Components (Part 1 of 54
3)
PL 2.1 Paper Feed / Carriage Assembly Components (Part 2 of 55
3)
PL 2.1 Paper Feed / Carriage Assembly Components (Part 3 of 56
3)
Part Number Index 57
6 General Procedures
Diagnostics 58
....GP 1 Printhead Test 59
....GP 2 Printing with DOS 60
Product Specifications 61
....Physical Characteristics 62
....Electrical Requirements 63
....Printer Capabilities 64
....Supplemental Items 65
Printer Overview and Technical Overview Introduction 66
....Printer Overview 67
........Printer Specifications 68
........Features and Operation 69
........Safety Notes 70
........Printer Installation 71
....Printer Operation 72
........Loading the paper 73
........Test print mode 74
........Connecting the printer to a computer 75
Table of Contents Page
........Control panel 76
........Printing 77
....Printer Maintenance 78
........Cleaning 79
........Replacing the Printhead 80
........Troubleshooting 81
........Removal / Replacement of the printer components 82
Technical Overview 83
....Power and Control 84
........Standby power 85
........Run control functions 86
........Main Control Board 87
........Control Panel Assembly 88
........Bi-Directional Cable 89
....Printing and Priming 90
........Printing 91
........Print control 92
........Cleaning and Priming 93
....Ink Level Sensing 94
........Ink Cartridge Present 95
........Low Ink Detection 96
........Out of Ink Detection 97
....Carriage Drive 98
........Carriage drive 99
........Carriage movement at power on 100
....Encoder 101
........Status code 102
....Paper Supply / Paper Feed 103
........Paper supply 104
........Paper feed 105
........Load and eject mechanism 106
....Sensors and status indicators 107
........Sensors 108
........Status indicators 109
7 Wiring Data
Plug / Jack Location Index 110
Plug / Jack Location Drawings 111
....Figure 7-1. Main Control Board and Power Supply 112
....Figure 7-2. Carriage Assembly (Bottom View) 113
....Figure 7-3. Carriage 114
....Figure 7-4. Front View 115
Block Schematic Diagrams (BSDs) 116
....Chain 1 AC/DC Power Generation 117
....Chain 2 Selection and Indication 118
Table of Contents Page
....Chain 3 Machine Run Control 119
....Chain 8 Paper Feed 120
....Chain 9 Print Control 121
Page: 1
Service Manual - OKIJET 2500
Chapter 0 Introduction

Front Cover

OKIJET 2500 Service Manual

P/ N 59228801

Adobe Acrobat printable reference copy
of the OKIDATA Service Training Manual.
03/20/98

Note: This Adobe Acrobat version of the Okidata Service Training Manual was built with
the pictures rendered at 300 dpi, which is ideal for printing, but does not display well
on most displays.

Disclaimer/Copyright

Disclaimer
This document may not be reproduced without the written permission of Okidata Training and
Publications. Every effort has been made to ensure the accuracy of the information contained in this
training course. Okidata is not responsible for errors beyond its control.

Edited by:
Okidata Training and Publications

Prepared by:
Multinational Customer and Service Education
Xerox Corporation, Rochester, New York 14644

Please address any comments on this publication to: Okidata's web site at: www.okidata.com

Telephone 609- 235- 2600

Facsimile 609- 222- 5320

Okilink Technical Training

OKIDATA is a registered trademark of Oki Electric Industry Company, Ltd.; marques deposee de Oki
Electric Industry Company, Ltd.; marca registrada, Oki Electric Industry Company, Ltd.

XEROX is a trademark of Xerox Corporation

Notice
All service documentation is supplied for informational purposes only. Okidata service documentation is
intended for use by certified, product trained service personnel only. Okidata does not warrant or
represent that such documentation is complete, nor does Okidata represent or warrant that it will notify or
provide to such customer any future changes to this documentation. Customer performed service of
equipment, or modules, components or parts of such equipment may affect the warranty offered by
Okidata with respect to such equipment. You should consult the applicable warranty for its terms
regarding customer or third party provided service. If the customer services such equipment, modules,
components or parts thereof, the customer releases Okidata from any and all liability for the customer
actions, and the customer agrees to indemnify, defend and hold Okidata harmless from any third party
claims which arise directly or indirectly from such service.

About This Manual

This manual contains Repair Analysis Procedures, Repair Procedures, Adjustment Procedures, Parts List,
Diagnostic Procedures, and Wiring Data information that will enable a Service Representative to repair the
Printer.

Organization

This manual is divided into seven sections. The title and description of each section are listed below.

Section 1 - SERVICE CALL PROCEDURES

This section contains the following:

Initial Actions / System Checks
System Checkout
Final Action

Initial Actions / System Checks

This diagram identifies how to collect the data necessary to decide how to proceed with the service call. It
classifies the problem and refers you to the appropriate Repair Analysis Procedure.

System Checkout

The System Checkout procedure is used to verify that the printer is operating properly after a repair has
been made.

Final Action

The Final Action procedure identifies the steps that must be performed before finishing the repair.

Section 2 - REPAIR ANALYSIS PROCEDURES (RAPs)

This section contains the Repair Analysis Procedures (RAPs) necessary to repair faults. When using a
RAP, always exit the procedure when the fault is fixed. Do not perform the remaining steps.

Section 3 - IMAGE QUALITY REPAIR ANALYSIS PROCEDURES (RAPs)

This section contains the Repair Analysis Procedures (RAPs) necessary to repair print quality faults. The
first RAP, IQ 1 Image Defect Entry RAP, is used to classify a print quality problem and will reference the
RAP to be used to repair the problem. When using a RAP, exit the procedure when the fault is fixed. Do
not perform the remaining steps.

Section 4 - REPAIR / ADJUSTMENT PROCEDURES

This section contains the repair and adjustment procedures for the printer.

Section 5 - PARTS LIST

This section contains the detailed Parts List for the printer.

Section 6 - GENERAL PROCEDURES

This section contains Diagnostic Procedures and Product Specifications for the Printer. An Overview and
Technical Overview section are also included.

Section 7 - WIRING DATA

This section contains Plug/ Jack Location Drawings and Block Schematic Diagrams (BSDs).

How To Use This Manual

The Service Call Procedures will direct you to the proper section of the Service Manual.

You should begin the service call with the Initial Actions / System Checks Procedure. From there, you will
be referenced to either Section 2, Status Indicator RAPs or Section 3, Image Quality RAPs.

If you are sent to Section 3, you will perform the IQ 1 Image Defect Entry RAP to classify the print quality
problem. You will then be directed to the proper RAP to begin your troubleshooting. From these RAPs
you may be referenced to other sections of the manual to make checks, adjustments or to replace parts.

When you have made a repair, return to the System Checkout / Final Action to complete the call.

Reference Symbology

Notes, adjustments, and parts lists support the checklists and the RAP information. The symbols that refer
to this supportive data are shown below.

Note
This symbol is used to refer to notes found on the same page.

Adjustments
ADJ 4.1 This symbol refers to an adjustment procedure located in Section 4 of this
Service Manual. The number adjacent to the symbol indicates the number that is
assigned to that adjustment.

Parts List

PL 10.6 Refers to the parts list located in Section 5 of this Service Manual. The number
after the PL designation indicates the number that is assigned to that part.

Special Symbols

Descriptions of all commonly used graphic symbols are included in order to aid in troubleshooting when
using the RAPs.

Interrupt Horizontal Signal
This indicates the continuation of a signal line which is interrupted in a horizontal
direction.

Standby Power Input
This indicates the continuation of a standby power line which is interrupted in the vertical
direction.

Left to Right Flow
This indicates the direction of signal flow.

Feedback
This indicates a feedback signal.

Flag
This is used to identify an area of a Circuit Diagram that you should check.

Ground
This indicates a machine ground.

LED / Phototransistor Sensor
This type of sensor is used in the paper path. It uses reflected light to switch the sensor
off and on.

Without Tag Change
This signal indicates that the area the triangle points to has not been modified by the tag
number in the circle.

This symbol indicates that the entire page has not been modified by the tag number in the
circle.

With Tag Change
This symbol indicates that the area the triangle points to has been modified by the tag
number in the circle.
This symbol indicates that the entire page has been modified by the tag number in the
circle.

WARNING
A warning is used to alert the personnel to an operating or maintenance procedure,
practice, or condition that, if not strictly observed, could result in injury or loss of
life.

CAUTION
A caution is used to alert the personnel to an operating or maintenance procedure,
practice or condition that, if not strictly observed, could result in damage to, or destruction
of, equipment.

Signal Nomenclature

The signal is named to imply the condition of the machine when the signal is available.

For example:

Logic state when the signal is available in its named state. In this case, the signal is LOW when a
document jam is sensed.

DC Voltage Levels

DC voltages should be measured between the test point and machine GND, unless instructed otherwise.
The table below shows the values of the voltages.

Nominal Voltage Logic State Actual Voltage Ranges
+5 VDC H +4.8 to +5.2 VDC
L 0.0 to +1.0 VDC
+42 VDC H +39.0 to +44.0 VDC
L 0.0 to +3.0 VDC

Switches and Relay Contacts

Safety interlock switch that is open.

Safety interlock switch that is closed.

Switch or relay contacts with momentary contacts shown normally open.

Switch or relay contacts with momentary contacts shown normally closed.

Back Cover

OKI
OKIJET 2500 Service Manual

P/ N 59228801

Printed in the U. S. A.

Introduction

Use the Service Call Procedures as a maintenance guide when performing any service on the printer.

Printer Maintenance - This section contains a list of the printer subsystem components to be cleaned
and /or lubricated and the cleaning and lubricating materials to be used, when that subsystem is
accessed during a repair.
Initial Actions / System Checks - This diagram identifies and classifies the printer problem and refers
you to the appropriate RAP in order to repair the problem. When the problem has been repaired,
perform the System Checkout / Final Action.
System Checkout / Final Action - This procedure should be completed at the end of every repair call
to ensure that the printer is operating properly.

Printer Maintenance

Introduction

When the printer is being serviced, the following maintenance procedure should be performed.

Procedure

Clean the following parts every time the printer is serviced:

Description Procedure
Cover Clean using a Lint Free Tissue and water.
Paper Feed Roller Clean using a Lint Free Tissue and water.
Paper Feed Pinch rollers and Paper Feed Guide Clean using a Lint Free Tissue and water.
Maintenance Station Clean using a Lint Free Tissue and water.

Initial Actions

1. QUESTION THE OPERATOR.

2. VERIFY, CLASSIFY AND REPAIR THE PROBLEM.

System Checkout / Final Action

Reset the Ink Level Sensing count to zero. Perform the following:

Install a Color Printhead with empty ink cartridges.
Run a Test Print.
Remove the Printhead and install a Color Printhead with full ink cartridges.
Run a Test Print.
The NVM counts are now set to zero.

Print a file.
The Printer prints the selected file.
Y N
Refer to Initial Action / System Checks to begin your repair.

Evaluate the print.
Is the image quality acceptable?
Y N
Go to the image quality RAP identified by the IQ 1 Image Defect Entry RAP (Section 3).

Print and check the "Printing Alignment Test pattern".
The alignment is good.
Y N Go to the Printhead Alignment Procedure (Section Four).

Clean exterior of machine. Use a lint free tissue and water. Provide a sample of the Test Print.

Error LED On RAP

Initial Action:
Ensure a color printhead is installed.

Remove the power cord from the printer for 10 seconds, then reinstall it.
Press the Power switch.
The Error LED is on steady.
Y N
The Error LED is flashing.
Y N
Press and hold the Resume/FF button for 2 seconds to print the demo print.

The Error LED is steady.
Y N
The Error LED is flashing.

Y N
Check the interface cable and connectors for an open wire or bad
connection. If OK, replace the Main Control Board.

Go to Error LED Flashing RAP.

Remove the power cord from the printer for 10 seconds, then reinstall it.
Press and hold the Power switch for about 2 seconds.
The carriage was noisy.
Y N
The printhead stopped at each ink cartridge during the power-on cycle.
Y N
Go to 6.2 Encoder RAP.

A B C D

Go to 8.1 Paper Feed RAP.
Go to 6.1 Carriage RAP.
Go to Error LED Flashing RAP.
One or more low ink LED(s) are blinking.
Y N
Go to 6.1 Carriage RAP.
Go to Low Ink LED(s) on RAP.

Power LED Blinking RAP

Remove the power cord from the printer for 10 seconds, the reinstall it.
The Power LED blinks.
Y N
Printer is OK.

Go to 2.1 Selection/Indication RAP.

Low Ink LED(s) On RAP

Initial Action:

Ensure all the ink cartridges are full and properly seated.

Go to Flags 1 and 2. Check the wires and connections for an open circuit. The wires are good.

Y N
Repair the wires or connections if possible.
Replace the main control board.
If the problem still exists, replace the Printer.

Replace the Ink Level Sensor (PL 2.1) located in Chapter 5.
Replace the main control board.
If the problem still exists, replace the printer.

Error LED Flashing RAP

Note: This procedure will work only when the Error LED is flashing.

Note: In the following procedure, the Error LED and Power LED will be used to display an 8 bit binary
error code. The LEDs will flash in 1/2 second intervals. The code will be displayed 4 bits at a time. The
LED code is as follows (See Figure 1):

1 = Both Error and Power LEDs lit

0 = Error LED only is lit

1. Press and release the Resume/ FF button, while observing the Error and Power LEDs.
2. 4 bits will be flashed in 1/ 2 second intervals followed by a pause, then 4 more bits in 1/ 2 second
intervals. After the cycle, the Error LED will continue to flash.
3. Determine the code and go to the Error Code Chart (Table 1) for the corrective action.
4. Repeat step 1 as many times as necessary to determine the code.

Error Code Error Description Corrective Action
1000 1000 ROM error Replace the Main Control Board
1000 1100 RAM error Replace the Main Control Board
1100 1000 EPROM error Replace the Main Control Board
1110 1000 CPU error Replace the Main Control Board
1100 1111 Carriage home position error Go to 6.1 Carriage RAP

1.1 Power on RAP

Refer to Figure 1. There is +42 VDC measured on the Main Control Board.

Y N
Disconnect the power cord.
Check fuse F1 on the Power
Supply.
F1 is blown.
Y N
Go to Flag 1 (Figure 2) and check the wires for an open circuit. If good, replace the Power
Supply. If problem still exists, replace the Main Control Board.
Replace the blown fuse.
If the problem is not corrected, replace the Power Supply (PL 1.1).

Refer to Figure 1. There is +5 VDC measured on the Main Control Board.
Y N
Go to Flag 2 and check for a short to ground. If OK, replace the Power Supply. If problem still
exists, replace Main Control Board.

Replace the Main Control Board before replacing the Control Panel Assembly.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 28
Service Manual - OKIJET 2500
Chapter 2 Repair Analysis Procedures (RAPs)

2.1 Selection/Indication RAP

Load paper.
Disconnect and then reconnect the power cord while observing the LEDs.

All LEDs light momentarily when the power cord is reconnected.
Y N
One or more LEDs light.
Y N
Go to 1.1 Power on RAP.

Go to Flag 1 and Flag 2 and check for an open wire. If OK, replace the Control Panel
Assembly.

All LEDs go out in approximately 10 seconds.
Y N
If the Power LED remains on (flashing), go to Flag 3 and check for an open wire. If OK,
replace the Control Panel Assembly.

Press and hold the Power button for approximately 2 seconds to turn on the printer.

Press and hold the Resume/FF button for 2 seconds.

Paper feeds.
Y N
Go to Flag 5 and check for an open wire.
If good, go to 8.1 Paper Feed RAP.

A
Press the Cartridge Change button.
The carriage moves to the center position.
Y N
Go to Flag 4 and check for an open wire.
If OK, replace the Control Panel Assembly.

For printer set up problems when printing from a DOS application, consult GP 2 Printing with
DOS Procedure in Section 6.

Examples of printer set up problems.
Just a few lines of data are printed and then the paper continues to line feed without printing.

6.1 Carriage TAP

Disconnect and then reconnect the power cord.
Press and hold the Power switch.
The carriage moves.
Y N
Go to Flag 1 and check the ribbon cable for being open or damaged.
Go to Flag 2 and check for an open circuit. If the wire is good, replace the Main
Control Board.
Check / replace the ribbon carriage cable.
Check the teeth on the belt.
Check the teeth on the carriage motor.
Check for 42 volts.
If 42 volts aren't being supplied by the power supply, replace the power supply.
Check / replace the carriage motor.

Perform the following:
Check that the Printhead ribbon cable going to CN4 on the Main Control Board is
connected properly.
Go to Flag 2 and Flag 3 and check for an open circuit.
If the wires are good, replace the Printhead Ribbon Cable (PL 2.1---see Chapter 5).
If the problem continues replace the Main Control Board (PL 1.1).
Check / replace the ribbon carriage cable.
Check the teeth on the belt.
Check the teeth on the carriage motor.
Check for 42 volts.
If 42 volts aren't being supplied by the power supply, replace the power
supply.
Check / replace the carriage motor.

6.2 Encoder RAP

Go to Flag 1 and check the ribbon
Go to Flag 4 and check for an open circuit.
Replace the Encoder.
Go to 6.1 Carriage RAP.

8.1 Paper Feed RAP

Clear any paper in the printer.
Disconnect and then reconnect the power cord.
Press and hold the Power switch for about 2 seconds.
Press and hold the Resume/FF button for 2 seconds to print the demo print.
The paper feeds or partially feeds.
Y N
Check that the Paper Tray is installed correctly (REP 1.1)
Go to Flag 1 and check the cam sensor circuit for an open.
If OK, go to Flag 3 and check for an open circuit. If paper feed motor circuit is
defective, replace the paper feed motor.
If the wires are good, replace the Main Control Board.

Go to Flag 2 and check the paper feed switch circuit for an open.
If OK, go to Flag 3 and check for an open circuit.
Replace the Back pad.
If the problem still exists, replace the Main Control Board.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 32
Service Manual - OKIJET 2500
Chapter 2 Repair Analysis Procedures (RAPs)

9.1 Blank Print RAP

Initial Action:

Ensure that the Printhead latch is positioned towards the rear.

Unlatch the Printhead, reset the Printhead and latch it back into position. If problem still exists:

Replace the Printhead.
Go to Flag 1 and check the ribbon cable for being damaged.
Check the terminals of J11 on the Carriage Assembly and J12 on the Ink Cartridge for being
contaminated or damaged. Clean or repair as necessary.
If the problem still exists, replace the Printhead Ribbon Cable (PL 2.1--see Chatper 5).

IQ 1 Image Defect Entry RAP

1. Print the Test Print:

a. Load paper into the Paper Tray.

b. Press and hold the Power on / Reset button for approximately 2 seconds and then release, to switch
the Printer power off.

c. While pressing and holding the Resume/ FF button press and release the Power on / Reset button.
The printer prints the test print shown in Figure 1. When the test print is complete, the printer initializes
and returns to the Ready status.

d. If the test print fails to print, repeat steps a through c.

2. Refer to the DEFECT Column in Table 1 that best describes the image quality problem.

3. If the problem is with external input only, replace the Main Control Board.

IQ 1 Image Defect Entry RAP Table

DEFECT CAUSE SOLUTION
Blank print Printhead 1. Remove and reinstall the Printhead.
2. Press the Cartridge Change / Clean
button for 2 seconds to clean and restore
the Printhead. Repeat if necessary.
If the problem still exists go to the 9.1 Blank
Print RAP.
White horizontal lines and The Printhead Perform the following:
Streaks nozzles may be 1. Press the Cartridge Change / Clean
blocked. button for 2 seconds to clean and restore
the Printhead.
2. Make another Test Print. If the print still
has lines and streaks repeat the above
process up to 5 times.
3. If the problem still exists, replace the
Printhead.
Print is faint or missing A non Replace the paper.
recommended
paper is being used
or the paper is
damp.
Defective Cartridge. Perform the following:
The ink supply may 1. Press and hold the Cartridge Change /
be nearly empty. Clean button for 2 seconds to clean and
The Printhead restore the Printhead.
nozzles may be 2. Run a Test Print. If the print is still faint,
blocked. repeat the process up to 2 more times.
3. If the problem is still not corrected
replace the Printhead.
Blurry or jagged vertical Printhead Perform ADJ 2.0 Printhead Alignment
lines Alignment Procedure
If the problem still exists switch the printer to
the High Quality print mode (in the printer
driver).
Paper Turn the paper over to print on the opposite
side.
Print image is clipped or Print off edge of Ensure that the Print Driver setup has the
off edge of media media. correct selection of media size and type.
Document margins Adjust margins in the application as necessary.
may exceed printer
margins.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 35
Service Manual - OKIJET 2500
Chapter 4 Repair / Adjustment Procedures

REP 1.0 Printhead

Parts List on PL 2. 2

Removal

1. Open the Cartridge Cover (PL 1.1).

2. Center the carriage using either of the following procedures:

Press the Cartridge Change / Clean button.

WARNING: Switch off the power. Disconnect the power cord from the wall outlet.

Grasp and manually move the belt (PL 2.1) in order to center the Printhead (Figure 1).

CAUTION: Store the Printhead in the Storage Box. Leaving the Printhead removed for long periods of
time will cause the ink nozzles to dry out. Image quality defects or a blank page could result. If necessary,
prime the printhead after reinstallation. (See below to Refer to the Replacement / Priming section of this
procedure.)

3. Move the Printhead lock lever toward the front of the printer.

4. Lift and remove the Printhead. Store it in the Storage Box.

Replacement / Priming

1. Install the Printhead onto the Printhead vertical guide.

2. Move the Printhead lock lever toward the rear of the printer.

3. Close the Cartridge Cover.

4. Press the Resume / FF button to prime the Printhead.

NOTE: The optional high capacity printhead is shown. Refer to the User's Documentation for illustrations
of the standard printhead.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 36
Service Manual - OKIJET 2500
Chapter 4 Repair / Adjustment Procedures

REP 1.1 Paper Tray Assembly

Parts List on PL 1. 1

Removal

1. Remove the Output Tray (PL 1.1).

2. Press the two handles toward the rear of the printer to release the latches (Figure 1).

3. Pivot the Paper Tray Assembly toward the back of the printer to disengage the three tabs at the bottom
of the Paper Tray Assembly from the tabs on the Paper Feed / Carriage Assembly.

4. Lift the Paper Tray Assembly from the printer.

Replacement

1. Retract the moveable face of the Paper Tray Assembly by pressing it toward the back of the Paper Tray
Assembly.

2. Insert the Paper Tray Assembly into the printer (with bottom of tray touching the bottom of the tray
opening on the printer) ensuring the moveable face is behind the white cam (near the bottom, on the left).
See Figure 2.

3. Engage the three tabs at the bottom of the Paper Tray Assembly with the tabs on the Paper Feed /
Carriage Assembly.

4. Rotate the Paper Tray Assembly toward the front of the printer.

5. Engage the two latches by gently pulling the handles downward and toward the front of the printer until
the latches snap into position.
6. Reinstall the Output Tray.

REP 1.2 Cartridge Cover

Parts List on PL 1. 1

Removal

1. Open the Cartridge Cover (PL 1.1).

2. Utilizing a screwdriver or similar tool, slightly separate the Cartridge Cover and Top Cover at either pivot
to release the Cartridge Cover pivot from the Top Cover (Figure 1).

3. Lift the Cartridge Cover from the printer.

Replacement

1. Insert either Cartridge Cover pivot into the corresponding Top Cover pivot hole.

2. Utilizing a screwdriver or similar tool, slightly separate the Cartridge Cover and Top Cover at the
opposite pivot.

3. Position the Cartridge Cover pivot to engage with the pivot hole of the Top Cover.

4. Close the Cartridge Cover.

REP 1.3 Top Cover

Parts List on PL 1. 1

Removal

CAUTION: Store the Printhead in the Storage Box. Leaving the cartridge removed for long periods of time
will cause the ink nozzles to dry out. Image quality defects or a blank page could result. If necessary,
prime the printhead after
reinstallation. (REP 1.0)

1. Remove the Printhead (REP 1.0). Store the Printhead in the Storage Box.

WARNING: Switch off the power. Disconnect the power cord from the wall outlet.

2. Remove the Output Tray (PL 1.1).

3. Remove the Paper Tray Assembly (REP 1.1).

4. Remove the Cartridge Cover (REP 1.2).

5. Lay the printer on it's back; release the three front latch tabs (Figure 1).

CAUTION: While removing the Top Cover from the printer, take care not to damage the ribbon cable that
is connected to the Control Panel Assembly, which is located inside the Top Cover.

NOTE: The rear of the Top Cover has three locator tabs and two latch tabs.

6. Return the printer to its normal operating position. Lift and hold the front of the cover slightly while
releasing the two rear latch tabs. Then lift the rear of the cover and pivot towards the FRONT of the printer
to remove.

Replacement

1. Ensure the ribbon cable is properly routed and not twisted during Top Cover installation.

2. If previously disconnected, reconnect ribbon cable to the Control Panel Assembly.

3. Position the Top Cover on the printer. Align and latch the rear latches; then the front latches.

4. Reinstall the following:

a. Cartridge Cover (REP 1.2)

b. Paper Tray Assembly (REP 1.1)
c. Output Tray (PL 1.1)

d. Printhead (REP 1.0)

REP 1.4 Exit Guide

Parts List on PL 2. 2

Removal

1. Remove the Printhead (REP 1.0). Store the Printhead in the Storage Box.

WARNING: Switch off the power. Disconnect the power cord from the wall outlet.

2. Remove the Output Tray (PL 1.1).

3. Remove the Cartridge Cover (REP 1.2).

4. Position both thumbs at the lower, front corners of the Exit Guide (Figure 1). Apply modest pressure
simultaneously toward the rear and up to unlatch the Exit Guide.

5. Rotate the guide approximately 90

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